Code:
on *:text:*:#mychsnnel: {
  if (!list isin $1) .play $chan !list.txt 2000 
  ; (plays a text file to the channel)
  if (!hit isin $1) .play -m $nick !hit.txt 2000 
  ; (plays a text file to the user)
}


put the above in a new remote file (alt + R .. file .. new)

put your text you want played in a (.txt) file in the main mirc folder, and change the above to call that filename